[committed] libstdc++: Fix some -Wunused warnings in tests

[Jonathan Wakely via Gcc-patches]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

libstdc++-v3/ChangeLog:

        * include/ext/pb_ds/detail/type_utils.hpp (PB_DS_STATIC_ASSERT):
        Add unused attribute to avoid -Wunused-local-typedef warnings.
        * testsuite/17_intro/tag_type_explicit_ctor.cc: Add pragma to
        ignore -Wunused-variable warnings
---
 libstdc++-v3/include/ext/pb_ds/detail/type_utils.hpp      | 3 ++-
 libstdc++-v3/testsuite/17_intro/tag_type_explicit_ctor.cc | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/ext/pb_ds/detail/type_utils.hpp 
b/libstdc++-v3/include/ext/pb_ds/detail/type_utils.hpp
index 52d05392975..c3db6c93ea6 100644
--- a/libstdc++-v3/include/ext/pb_ds/detail/type_utils.hpp
+++ b/libstdc++-v3/include/ext/pb_ds/detail/type_utils.hpp
@@ -152,7 +152,8 @@ namespace __gnu_pbds
     };
 
 #define PB_DS_STATIC_ASSERT(UNIQUE, E)  \
-    typedef 
__gnu_pbds::detail::__static_assert_dumclass<sizeof(__gnu_pbds::detail::__static_assert<bool(E)>)>
 UNIQUE##__static_assert_type
+    typedef 
__gnu_pbds::detail::__static_assert_dumclass<sizeof(__gnu_pbds::detail::__static_assert<bool(E)>)>
 \
+      UNIQUE##__static_assert_type __attribute__((__unused__))
 
 #endif
 
diff --git a/libstdc++-v3/testsuite/17_intro/tag_type_explicit_ctor.cc 
b/libstdc++-v3/testsuite/17_intro/tag_type_explicit_ctor.cc
index 410142d3974..fead30f63c3 100644
--- a/libstdc++-v3/testsuite/17_intro/tag_type_explicit_ctor.cc
+++ b/libstdc++-v3/testsuite/17_intro/tag_type_explicit_ctor.cc
@@ -34,6 +34,8 @@ void f5(std::try_to_lock_t);
 void f6(std::adopt_lock_t);
 #endif
 
+#pragma GCC diagnostic ignored "-Wunused-variable"
+
 int main()
 {
   std::nothrow_t v1;
-- 
2.38.1